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Control methods:
Because of its strong mobility, prevention and control should be put together for prevention and control, otherwise it is difficult to obtain good results.
1, bait trapping. Use 60°C-70°C water to dissolve 90% of the crystals of trichlorfon into 30-fold solution. Take 1 kg of liquid and blend evenly with 30-50 kg of sauteed wheat bran or cake flour (add water when mixing, add The amount of water is usually 1-1.5 times the weight of the bait, and 3-5 kg ​​of mu is used. It is applied between the rows in the evening, usually 2-3 times.
2, heap grass trapping. Using the hidden nature of the daytime, a certain number of straw piles of 5-15 cm in thickness can be set in the field of rapeseed field or land, which can attract large numbers of young and adult insects and concentrate hunting.
3, chemical control. Acres were sprayed with 20% extinct fentanyl (fenvalerate) in 30 ml of water and 40 kg of water from the rape field four weeks before or after 5 pm. Spray once every 7 days and spray 2-3 times continuously.
Rape field control
The cricket, also known as cricket, is an orthopteran cricket, and it is burrowing and burrowing. It hides during the day and comes out at 20-23 in the evening. September-October is the period of occurrence of adult worms, which mainly harm rapeseeds and vegetable seedlings, resulting in culmination of ridges and ridges. In severe cases, the whole field destroys seedlings and needs to be replanted.